HP 8555A User's Manual
Contents
1. 1 23 The RF Section is shipped with three coaxial type terminations and one multi section termina tion The coaxial terminations are installed on the EXT MIXER port the FIRST LO OUTPUT port and the SECOND LO OUTPUT port See Figure 3 1 items 17 18 and 19 The multi section termination is shipped taped to the top of the RF Section Install the multi section termination on the Display Section rear panel See item 3 Figure 3 3 The coaxial terminations are HP part number 11593A and the multi section termination is HP part number 08553 60122 General Information 1 24 EQUIPMENT REQUIRED BUT NOT SUPPLIED 1 25 The 8555A Spectrum Analyzer RF Section must be mated with an 8552 series Spectrum Analyzer IF Section and one of the 140 series Display Sections or 140 series Oscilloscope Main frames before the units can perform their function as a spectrum analyzer The 1408 140 T 143S Dis play Sections are equipped with a fixed persis tence non storage CRT whereas the 1415 and 141T Display Sections are equipped with a variable persistence storage CRT Overlays to provide LOG and LINEAR graticule scales are available for use with the standard 140A and 141A Oscilloscope Mainframe 1 26 Operating accessories for use with the 8555 8552 140 Spectrum Analyzer are listed in Table 1 3 Operating accessories include a wave guide mixer adapters filters and a frequency comb generator An external waveguide mixer and appropriate adapt2. 2 sequence on an 8 division display Display Uncalibrated Light Panel light warns operator of uncalibrated amplitude display if the IF or video bandwidth selected is too narrow for combination of scan width and scan time se lected Input Attenuator Range 0 50 dB in 10 dB steps ABSOLUTE CALIBRATION ACCURACY The overall absolute calibration accuracy of the spectrum analyzer in a particular application is a function of the measurement technique The foliow ing elements also affect absolute calibration accuracy Frequency Response With 10 dB input attenuator setting Frequency Mixing Frequency Range Mode IF Freq Response GHz n MHz dB max 0 01 2 05 1 2050 1 0 1 50 3 55 1 550 t1 0 2 07 6 15 2 2050 11 25 2 60 4 65 Lr 550 14 0 4 11 6 15 1 2050 1 0 4 13 10 25 3 2050 1 5 6 17 10 25 2 2050 135 6 19 14 35 4 2050 12 0 8 23 14 35 3 2050 2 0 10 29 18 00 A 2050 12 0 IF gain variation with different bandwidth settings at 20 C Log 0 5 dB Linear 5 8 Amplitude Display Log 0 25 dB dB but not more than 1 5 dB over the full 70 dB display range Linear 12 8 of full 8 division deflection Input RF Attenuator Frequency response typically 30 6 dB from 10 MHz to 18 GHz Log Reference Level Accurate to 20 2 dB 52 396 Linear Sensitivity Log Reference Level Vernier Accurate to 10 1 dB 1 2 in 0 6 and 12 dB positions otherwise 0 25 dB 12 8 Cali
3. Adapter For mating 11517A Waveguide Mixer to R band 26 5 to 40 GHz system Frequency Comb For calibrating scan width function generates precision Generator markers with 1 10 and 100 MHz spacing Bandpass Filter Pass band 1 2 GHz Bandpass Filter Pass band 2 4 GHz Bandpass Filter Pass band 4 6 GHz Bandpass Filter Pass band 8 10 GHz Bandpass Filter Pass band 4 8 GHz Pass band 8 12 4 GHz Bandpass Filter Tracking Generator Functions as a frequency response measurement system when used with the Spectrum Analyzer The system can be used as a sweeper or signal generator 10 MHz to 1 3 GHz Functions to reduce or eliminate signal intermodulation and multiple and spurious responses Preselector is a low pass filter over the O to 1 8 GHz range and a voltage tuned filter over the 1 8 to 18 GHz range Automatic Preselector 100 kHz 1 3 GHz low noise preamp improves sensitiv ity or average noise level or RF Section approximately 18 dB Low pass Filter 360A cuts off at 700 MHz 360B cuts off at 1200 MHz Low pass Filter Acts like bandpass when used with waveguide available for X P K R bands eliminates signals outside normal waveguide band Bandpass Filter Pass band 6 8 GHz Model 8555A ES Frequency Comb Generator HF Signal Generator VHF Signal Generator UHF Signal Generator Signal Generator Signal Generator Sweep Oscillator Audio Oscil
4. Per Division 16 calibrated scan widths from 2 kHz div to 200 MHz div in a 2 5 10 sequence Manual Scan Available with 8552B only Scan determined by front panel control continu ously variable across CRT in either direction Zero Sean Analyzer becomes fixed tuned re ceiver with frequency set by frequency and fine tune controls and selectable bandwidths by bandwidth control Amplitude variations are displayed versus time on CRT FREQUENCY ACCURACY Dial Aecuracy n x 15 MHz where n is the mix ing mode Sean Accuracy Frequency error between two points on the display is less than 10 of the indi cated separation Stability Total Analyzer Residual FM Fundamental Mixing Stabilized _Unstabilized lt 100 Hz lt 10 kHz peak to peak peak to peak First LO residual FM typically 30 Hz Noise Sidebands For fundamental mixing More than 70 dB below CW signal 50 kHz or more away from signal with 1 kHz IF bandwidth and 100 Hz video filter 1 4 RESOLUTION Bandwidth Ranges IF bandwidths of 0 10 to 300 kHz provided in a 1 3 sequence Bandwidth Accuracy Individual IF bandwidth 3 dB points calibrated to 20 10 kHz bandwidth 15 Bandwidth Selectivity 60 dB 3 dB Bandwidth Ratio IF Bandwidth 8552A 8552B 10 kHz 300 kHz 20 1 20 1 1kHz 3 kHz 20 1 11 1 0 1 kHz 0 3 kHz 25 1 TL AMPLITUDE SPECIFICATIONS ABSOLUTE CALIBRATION RANGE Measurement Range CAUTION See Input Specifications for ma
5. 360C Low Pass Filter Insertion Loss lt 1 dB below 0 9 times cut off Rejection 2 50 dB at 1 25 times cut off freq frequency BNC Tee Two BNC Female Connectors one Male BNC UG 274A U T Connector HP 1250 0781 Adapter SMA Jack to BNC Plug HP 1250 0831 Adapter BNC Jack to BNC Jack UG 914 A U A HP 1250 0080 Adapter BNC Male to Type N Female UG 349A U CE HP 1250 0077 Adapter 2 BNC Female to Type N Male UG 201A U P A T HP 1250 0067 Crystal Frequency Range 0 01 12 4 GHz HP 423A Detector Frequency Response 0 5 dB Logic Level Compatibility DTL or TTL HP 10528A Logic Clip gt Indicator Power Requirements 5 volts 10 across any two pins Voltage Probe Dual Banana Plug to Probe Tip and Clip HP 10025A Straight A T Ground Lead through Voltage Probe Cable Assy 2 Male BNC Connectors 48 inches long HP 10503A P A T Cable Assy BNC Male to Dual Banana Plug 45 inches long HP 11001A Bp d USE A ADJUSTMENT P PERFORMANCE T TROUBLESHOOTING 1 12 Model 8555A General Information Table 1 5 Test Accessories cont d Required Features Suggested Model Cable Assembly Dual Banana Plug to Clip Lead and Probe HP 11003A 60 inches long Cable Assembly Male Type N Connectors 72 inches long HP 11500A Tuning Tool Nonmetallie Shaft 6 inches long General Cement 5003 Blade HP 8730 0013 Tuning Tool Nonmetallic 6 inch shaft Gowanda PC9668 Slot Wrench Open end 15 64 inch
6. INPUT LEVELS VOLTS miam Input Levels Incident on input Mixer The INPUT ATTENUATION control must be in the 80 dB or greater position when applying 33 dBm or in put mixer will be damaged The power levels listed apply for peak or average power ps not exceed 20 volts de Apply only de voltages with rise times less than 106 volts per second Do not change INPUT ATTENUATION levels when dc voltages are applied to RF INPUT Connector Set analyzer controls as follows FREQUENCY wol dri wx Fuii CCW FINE TUNE nedorind en ce sue dnut Centered DANDO Aon ane es See n 1 0 2 05 GHz TUNING STABILIZER ON SIGNAL IDENTIFIER sss OFF BANDWIDTH 0000 100 kHz SCAN WIDTH pda de FULL SCAN WIDTH PER DIVISION 20 MHz INPUT ATTENUATION 50 dB VIDEO FILTER corsu ucc ard ES 10 kHz SCAN TIME PER DIVISION 0 2 SECONDS SCAN MOU Bais ss A RECEN x e warn INT SCAN TRIGGER costas AUTO TOG BINEAR dica ence de IX LOG LOG ZRHLFLEVEL 2 uv 30 dBm PONE A oe ied tet ld ter Ee d ON WRITING SPEED laus bb REA STD INTENSITY a preeria ip hee oak 12 o clock PERSISTENCE 25 d a a RrEVAAMG MAX 2 steps CCW from 10 dBm Figure 8 5 Signal Identification Technique cont d 3 18 Operation 0 3 14 Adjust INTENSITY for a visible sean trace without blooming ERASE display as necessary between adjustments Adjust BASE LINE CLIP PER t
7. LII 2 E b WA ul 100 Hz a AN Bw a u4 oa 2 5 E 50 100 Hz kHz 10 kHz 100 kHz 1 MHz i FREQUENCY Figure 1 5 Typical Spectrum Analyzer Resolution Fundamental Mixing Model 8555A General Information Table 1 2 Supplemental Performance Characteristics cont d SUPPLEMENTAL PERFORMANCE CHARACTERISTICS Continued Single Single scan with reset actuated by front panel pushbutton Ext Sean determined by 0 to 8 volt external signal scan input impedance 710 KQ Blanking 1 5V external blanking signal required Manual Scan determined by front panel control continuously variable across CRT in either direc tion 8552B only Sean Trigger For Internal Sean Mode select between l Auto Scan free runs Line Scan synchronized with power line frequency Ext Scan synchronized with gt 2 volt 20 volt max trigger signal polarity selected by inter nally located switch in IF Section Video Scan internally synchronized to envelope of RF input signal signal amplitude of 1 5 major divisions peak to peak required on dis play section CRT DISPLAY CHARACTERISTICS Variable Persistence Storage Model 141T Plug ins Accepts Model 8550 series Spectrum Analyzer plug ins and Model 1400 series time domain plug ins Cathode ray Tube Type Post accelerator storage tube 9000 volt accelerating potential aluminized P31 phosphor etched safety glass faceplate reduces glare Function
8. Wrench Open end 5 16 inch Screwdrivers Phillips No 1 Phillips No 2 Pozidriv No 1 Small Stanley No 5531 HP 8710 0899 Pozidriv No 2 Medium Stanley No 5332 HP 8710 0900 gt 43 Prrl rl P Jajajaja 4 Tuning Tool Nonmetallic 2 5 inch shaft HP 8710 0095 Slot Cover Assy Modified display section cover see Paragraph Modified HP 5060 0740 3 40 Soldering Iron 47 1 2 watt Ungar No 776 with No 4037 Heating Unit Dummy Load Resistance 83 ohms 5 Wattage 20 watts 100 ohm HP 0819 0019 and 500 ohm HP 0819 0019 HP 0819 0035 in parallel HP 0819 0035 Voltage Divider Resistance 22 97K 1 1 4W 21 5K HP 0757 0199 in series with HP 0757 0199 1 47K HP 0757 1094 HP 0757 1094 Variable Resistance 2 5K ohms variable HP 2100 2729 Resistor Tuning tool kit Modified 5 16 inch nut driver HP 08555 HP 08555 20122 slug 20122 with modified number 10 Allen HP 08555 20121 driver HP 08555 20121 Ld gt gt gt E 3 USE A ADJUSTMENT P PERFORMANCE T TROUBLESHOOTING 1 13 1 14 Model 8555A installation SECTION I INSTALLATION 2 1 INITIAL INSPECTION 2 2 Mechanical Check 2 3 Check the shipping carton for evidence of damage immediately after receipt If there is any visible damage to the carton request the carrier s agent be present when the instrument is unpacked Inspect the instrument for physical damage such as bent or broken parts and dents or scratches If damage is found refer to
9. amplification 11 is selected times x lights when linear amplification 11 is selected With lighted LOG REF line is sum black numerals of LOG REF LEVEL controls With x lighted per division absolute voltage amplitude is product of blue numeral LINEAR SENSITIVITY control settings Provides a 30 MHz signal at 30 dBm for amplitude calibration of spectrum analyzer Indicates 1 dB increments for logarithmic ampli fication indicates muitiplication factors up to unity for linear amplification Provides pen lift operation to HP 7005 7035 1004 7034 and all new TTL compalible HP recorders Provides input for external blanking sig nal 1 5V for external scan mode operation Pro vides input for external positive or negative trigger pulses 2 20V normally negative polarity selected by internal switeh in IF Section for external scan trigger operation Detected video output proportional to vertical deflection on CRT For receiving an external scan ramp or output coupling for the internally generated scan ramp Input or output function determined by INT EXT positions of SCAN MODE switch Adjusts vertical position and gain of trace Adjusts horizontal position and gain of trace Selects scan trigger mode Selects 10 dB logarithmic or linear display mode in 85524 plus another 2 dB log position in 8552B The dB graduation black numerals opposite the lighted index lamp indicate the power level at
10. as well as damage to the instru ment P AC HOT LINE OPENS SAFETY GROUND ON AC NEUTRAL CHASSIS Figure 1 2 Circuit if Equipment Ground Lead Opens 1 8 CAUTION The input circuits of the Model 8555A are susceptible to burnout if fed an exces sively high signal level To avoid costly repairs and unnecessary down time the following precautions must be taken 1 Use maximum attenuation when applying signals of unknown amplitude 2 Ensure that the Spectrum Analyzer Display Section and any signal source to be coupled to the Spectrum Analyzer are both connected to the same power line ground before connecting an RF cable to the 8555A RF Input It has been estab lished by HP that floating either instru ment from ground may cause damage to the Spectrum Analyzer input mixer assembly 3 The input attenuation setting should not be changed while dc is applied to the RF Input 4 Do not connect impulse generators to the Model 8555A RF Input unless they are connected through a Model 8445A Pre selector i l General Information 9 Observe the following maximum input levels Maximum d Power Input Levels Dc Peak Input 01 18 GHz e p 14 4 Connector put Mixer line Input Attenuation Control must be in the 30 dB or greater position when applying 33 dBm or input Mixer will be dam aged The power levels listed apply for peak or average power 2Do not exceed 20 volts de Apply only de voltages with
11. of graticule and ends at last O o o00 Q Operation Readjust VERTICAL POSITION unti trace aligns with bottom line of graticule VERTICAL POSITION AND GAIN Connect CAL OUTPUT 30 MHz 30 dBm signal to RF INPUT select 100 kHz BANDWIDTH 10 MHz PER DIVISION SCAN WIDTH and set LOG REF LEVEL to 10 dBm Tune FREQUENCY to align LO feedthru signal on 3 graticule line The 30 MHz calibration signal should appear at the CENTER FREQUENCY grat icule line with a harmonic at the 3 graticule line 60 MHz The dial marker should indicate approx imately 30 MHz Reduce SCAN WIDTH PER DIVISION to 0 2 MHz Center signal on display with FREQUENCY control Reduce SCAN WIDTH PER DIVISION to 2 kHz keep signal centered on display with FINE TUNE Set LOG REF LEVEL to 30 dBm FINE TUNE to center signal on display Rotate AMPL CAL until trace is centered on top line of graticule at the CENTER FREQUENCY position Rotate LOG REF LEVEL counterclockwise and note that the signal decreases one division 10 dB for each calibrated switch position If trace moves one division per step in lower part of graticule but the amplitude creeps upward near top of gratieule adjust VERTICAL GAIN until each step is equal LINEAR AND LOGARITHMIC ADJUSTMENT Rotate LOG REF LEVEL control until signal irace appears on fourth graticule line from bot tom Set LOG LINEAR switch to LINEAR and rotate LOG REF LEVEL control until 1 mV DIV is matched
12. or 141T Display Section 9 1 16 in H incl feet x 16 3 4 in W x 18 3 8 in D 229 x 425 x 467 mm Model 1435 Display Section 21 in H inci feet x 16 3 4 in W x 18 3 8 in D 533 x 425 x 467 mm Weight Model 8555A RF Section Net 141b 150z 6 8 kg Model 8552A IF Section Net 9 Ib 4 1 kg Model 8552B IF Section Net 9 ib 4 1 kg Model 140T Display Section Net 37 lb 16 8 kg Model 141T Display Section Net 40 Ib 18 kg Model 143S Display Section Net 62 lb 28 1 kg General Information 1 6 oo LL T AMPLITUDE d8m 1 MHz 10 MHz 100 MHz Model 8555A Table 1 2 Supplemental Performance Characteristics SUPPLEMENTAL PERFORMANCE CHARACTERISTICS AMPLITUDE CHARACTERISTICS For typical sensitivity and frequency response versus input frequency see Figure 1 4 Spurious Responses Due to Second Harmonic Dis tortion With 40 dBm incident on input mixer Frequency 2nd Harmonie Range Distortion 0 1 6 2 GHz 63 dB 6 2 10 3 GHz lt 69 dB 10 3 14 4 GHz lt 54 dB 14 4 18 5 GHz 51 dB Spurious Responses Due to Third Order Inter modulation Distortion lt 70 dB with 30 dBm incident on input mixer and signal separation 1 MHz Video Filter Post detection filter used to average displayed noise With 8552A nominal band widths 10 kHz and 100 Hz With 8552B nominal bandwidths 10 kHz 100 Hz and 10 Hz Gain Compression For internal mixer gain compres sion 1 dB for 10 dBm peak or average
13. ri rise times less than 10 volts per second 1 9 INSTRUMENTS COVERED BY MANUAL 1 10 This instrument has a two part serial number see Figure 1 3 The first four digits and the letter comprise the serial number prefix The last five digits form the sequential suffix that is unique to each instrument SERIAL PREFIX SERIAL NUMBER Figure 1 3 Instrument Identification The contents of this manual apply directly to instruments having the same serial number pre fix es as listed under SERIAL NUMBERS on the title page 1 11 An instrument manufactured after the print ing of this manual may have a serial prefix that is not listed on the title page This unlisted serial prefix indicates that the instrument is different from those documented in this manual The manual for this instrument is supplied with a yellow Manual Changes supplement that contains change information that documents the differ ences 1 2 Model 8555A 1 12 In addition to change information the sup plement may contain information for correcting errors in the manual To keep this manual as current and aecurate as possible Hewlett Packard recommends that you periodically request the latest Manual Changes supplement The supple ment for this manual is keyed to this manuals print date and part number both of which appear on the title page Complimentary copies of the supplement are available from Hewlett Packard 1 13 For information concerni
14. the LOG REF graticule line on CRT when LOG LINEAR 11 is set to LOG With LOG LINEAR set to LINEAR the voltage graduations blue numerals opposite the lighted index lamp indi cate the per division multiplier for calibrated voltage amplitude Selects scan ramp mode Ramp is internally generated for SINGLE INT positions but it must be externally supplied for EXT position Refer to Item 7 Model 8552B has an added manual scan mode position Refer to Item 34 Controls SCAN TIME PER DIVISION Press to initiate scan with SCAN MODE switch set to SINGLE Press during scan to stop and reset scan Selects 100 Hz 10 kHz or OFF position of lowpass filter for detected video in 8552A plus an added 10 Hz in 8552B Lights for duration of each scan for single and internal sean modes Operation Blanks lower part of trace to prevent over exposure of photographs due to high intensity of baseline Blanking function also prevents blooming with a variable persistence storage display section QD Provides 1 and 10 volt peak to peak 60 Hz squarewave outputs CAUTION These calibrated outputs should never be used with the spectrum analyzer These outputs are for use only with the 1400 series oscilloscope plug ins QU Adjusts brightness of CRT display CAUTION Excessive brightness for a static or very slow moving trace may burn the phosphor and permanently damage the CRT This caution is applicable to both the fi
15. the specified type normal blow time delay etc are used for replacement The use of repaired fuses and the short circuiting of fuse holders must be avoided Whenever it is likely that the protection offered by fuses has been impaired the instrument must be made inoperative and be secured against any unin tended operation GROUNDING Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the protective earth terminal is likely to make this instrument dangerous Intentional interruption is prohibited HIGH VOLTAGE Any adjustment maintenance and repair of the opened instrument under voltage should be avoided as much as possible and when inevitable should be carried out only by a skilled person who is aware of the hazard involved Capacitors inside the instrument may stil be charged even if the instrument has been discon nected from its source of supply Adjustments and Service described herein is per formed with power supplied to the instrument while protective covers are removed Energy avail able at many points may if contacted result in personal injury CAUTIONS GROUNDING BEFORE SWITCHING ON THIS INSTRUMENT ensure that all devices connected to this instrument are connected to the protective earth ground BEFORE SWITCHING ON THIS INSTRUMENT ensure that the line power mains plug is con nected to a three conductor line power outlet that has a pr
16. times less than 2 x 10 amperes per second Do not exceed 20 volts dc or 1 0 volt ac peaks 3 13 Mixer Overload Characteristics The input mixer will provide absolute calibration at signal levels up to 10 dBm incident on the mixer Smaller signal levels will generally be necessary for distortion measurements to assure that the meas urement does not include distortion from the 8555A mixer See distortion data in Table 1 2 Supplemental Performance Characteristics 3 14 EXT MIXER Connector Provides an output for the 2 05 to 3 1 GHz first LO signal A de bias voltage adjustable from the front panel is supplied to the external mixer through this connector The 2 05 GHz IF signal generated by the external mixer is applied through this same connector The HP 11517A Waveguide Mixer is recommended as an accessory along with Waveguide Adapters 115184 11519A and 115204 for use over the 12 4 to 40 GHz frequency range Maximum input power for less than 1 dB signal compression is typically 03 mW peak for the 11517A To protect the external mixer diode inputs should never exceed 1 milli watt Terminate the EXT MIXER input with the 50 chm load supplied when not in use When using external mixing terminate the 01 18 GHz INPUT with the 50 ohm load or set INPUT ATTENUA 3 2 Model 8555A TION to 10 or 20 dB The input attenuator is not in the external mixing circuit but does control the LOG REF LEVEL index lamps Amplitude display
17. to the display section service manual for fuse replacement procedures Set INT EXT switch to INT Set to EXT only if CRT is to be externally modulated normally used with 1400 series time domain plug ins Connect 50 ohm termination AT4 FOCUS AND ASTIGMATISM ADJUSTMENTS Set POWER ON up observe that ON lamp lights BASE LINE CLIPPER fully cew SCAN WIDTH inner red to ZERO INPUT ATTENUATION to 10 dB BANDWIDTH to 0 3 kHz SCAN TIME PER DIVISION to 10 SECONDS SCAN MODE to INT SCAN TRIGGER to AUTO TUNING STABILIZER to ON FINE TUNE Control centered LOG LINEAR to LOG LOG REF LEVEL Vernier max CCW INTENSITY clockwise until trace is medium bright approx 1 o clock position BAND to 0 2 05 GHz VIDEO FILTER to OFF Adjust FOCUS and ASTIGMATISM controls until combined effect produces best resolution maxi mum roundness without fuzz of the dot TRACE ALIGNMENT Set SCAN TIME PER DIVISION to 10 MILLI SECONDS If not already aligned adjust TRACE ALIGN until trace is aligned with horizontal line of graticule HORIZONTAL POSITION AND GAIN For convenience in making these adjustments move trace to upper half of graticule by adiusting the VERTICAL POSITION control Rotate HORIZONTAL GAIN until trace is of minimum length Rotate HORIZONTAL POSITION until trace is centered on CENTER FREQUENCY line of grati cule Alternately adjust HORIZONTAL POSITION GAIN controls until trace begins at first line
18. tors can destroy both input attenuator and first converter See additional information in paragraphs 3 11 through 3 13 of Operating and Service manual prior to instrument operation 3 1 Operation 3 12 Input Attenuation The input attenuator is connected between the RF INPUT 01 18 GHz and First Converter The attenuator should be set to reduce the signal level at the attenuator output to 10 dBm average signal compression level The maximum input level for each position of the attenuator control for less than 1 dB signal com pression is indicated in red on the attenuator control dial Unless extra sensitivity is required at least 10 dB of input attenuation should be used This provides a 50 ohm termination for currents at the IF and LO frequencies that appear at the mixer s input port With the input attenuator set to O dB the RF INPUT is a dc block capable of withstanding 20 volts In other attenuator posi tions the input is a de return to ground of about 50 ohms and is capable of handling 400 mA see CAUTION When in the 0 dB position the input impedance is greater than 50 ohms This may cause some mismatch VSWR and display amplitude variation as the input frequency changes CAUTION Care must be taken when applying dc voltage to the RF INPUT of the analyzer Do not change INPUT ATTENUATION setting while dc is applied Apply only dc voltages with rise time less than 10 volts per second and current with rise
19. with the lighted index lamp Reading from bottom of graticule LIN scale signal amplitude should be 7 1 millivolts If it is not adjust AMPL CAL for a signal amplitude of 7 1 millivolts Set LOG LINEAR switch to LOG Rotate LOG REF LEVEL control until 30 dBm graduation matches the lighted index lamp Signal trace should align with top LOG REF line of the grati cule Figure 3 3 Operational Adjustments cont d 3 9 Operation Model 8555A ROCA DISPLAY eRTION OES NCEE EA MAWLET TH PRAKAAR CA fcUoN lo 7 pv LO REE pete a HOES PUTER idam DR RE ID o Perform Operational Adjustments Figure 3 3 TUNING STABILIZER SIGNAL IDENTIFIER BASE LINE CLIPPER set controls as follows SCAN TIME PER DIVISION POWER LOG REF LEVEL BANDWIDTH LOG REF LEVEL Vernier SCAN WIDTH SCAN WIDTH PER DIVISION MHz SCAN MODE INPUT ATTENUATION SCAN TRIGGER FINE TUNE VIDEO FILTER Figure 3 4 General Operating Instructions 01 to 18 0 GHz 3 10 Model 8555A Adjust INTENSITY for a display trace CAUTION DO NOT EXCEED THE FOLLOWING MAXIMUM INPUT LEVELS Max imum Input Levels Connec tor Incident on input Mixer lone INPUT ATTENUATION control must be in the 30 dB or greater position when applying 33 dBm or in put mixer will be damaged The power levels listed apply for peak or average Dower 2 Do not exceed X 20 volts de Apply only de voltages with rise times less than 106 volts per second Do not chan
20. CEED THE FOLLOWING or less MAXIMUM INPUT LEVELS POWER VOLTS eTe t E Incident on The INPUT ATTENUATION control must be in the 30 dB or greater position when applying 33 dBm or input mixer will be damaged The power levels Isited apply for peak or average power Maximum Input Levels o Dial Pointer Indicates center frequency to which analyzer is tuned by FREQUENCY Control 2 in PER DIVISION and ZERO scan modes Also indicates LO center frequency in PER DIVISION and ZERO scan modes Indicates marker fre Input quency in FULL scan mode Ganged to FRE 0 01 18 GHz QUENCY Control FINE TUNE does not move Connector dial pointer BANDWIDTH Control Selects 3 dB IF bandwidths to determine analyzer resolution in ZERO and PER DIVISION positions of SCAN WIDTH Mode Switeh 10 300 kHz bandwidth automatically selected in FULL sean mode faa po not exceed 20 volts de Apply only de voltages with rise times less than 106 volts per second Do not change IN PUT ATTENUATION levels when de voltages are applied to RF INPUT Connector o EXT MIXER BIAS Adjusts bias on external wave guide mixer diode adjusted for optimum mixer sensitivity SCAN WIDTH PER DIVISION Indicates fre Q DISPLAY UNCAL Display uncalibrated warning quency scan calibration scan widths from lights when relationship between scan time scan 2 kHz div to 200 MHz d
21. D PERSISTENCE MIN INTENSITY approximately 12 o clock Connect appropriate waveguide adapter to the mixer Adjust FREQUENCY control to position marker Connect waveguide adapter to signal source For i under signal of interest linear operation adjust signal source for output no greater than 03 milliwatt For minimum inter modulation and spurious signals keep input signal level at 30 dBm or below Set SCAN WIDTH to PER DIVISION and adjust FREQUENCY control to center signal on display o Set Frequency Band Switch to lowest BAND which covers range of signal under investigation External mixer bands are as follows n 6 10 25 22 55 GHz n 6 14 35 26 65 GHz n 10 18 45 38 95 GHz and n 10 22 55 43 05 GHz When other bands are selected the external mixer circuit path is opened by coaxial switches in the RF Section Adjust LOG REF LEVEL for a convenient signal to noise ratio Adjust EXT MIXER BIAS for best signal trace 66 6060060 6 YO Adjust BANDWIDTH SCAN WIDTH PER DI VISION and SCAN TIME PER DIVISION to o Set Analyzer controls as follows obtain best detail in region of interest POW Rata ON BAN O hide cia A See step5 QD Readjust EXT MIXER BIAS for maximum ampli EINE TUNE esas alas dix Centered tude Figure 3 6 External Mixer HP 11517A Operating Instructions 3 16
22. Generator HP 8616A B Signal Generator HP 8690B Sweep Oscil lator with 8693A B RF Unit 8694A B RF Unit 8695A B RF Unit 8699B RF Unit HP 200CD Audio Oscillator HP 652A Test Oscillator HP 5245L Frequency Counter w HP 525 7A Transfer Oscillator P PERFORMANCE A ADJUSTMENT T TROUBLESHOOTING 1 9 General Information Model 8555A Table 1 4 Test Equipment Required cont d Minimum Specifications Suggested Model Bandwidth 1 kHz HP 8405A Vector Frequency Range 1 1000 MHz Voltmeter Sensitivity 10 mV 1 Vrms Input Impedance gt 0 1 megohms Tunable RF Voltmeter Digital Voltmeter Voltage Accuracy 0 2 Range Selection manual or automatic Voltage Range 1 1000 Vdc full scale Input Impedance 10 megohms Polarity Automatic indication HP 3440A Digital Volt meter w HP 3443A Plug in HP 180A with HP 1801A Vertical Amplitier and HP 1821A Horizontal Amplifier HP 10004 10 1 Divider Probes 2 Oscilloscope Frequency Range Dc to 50 MHz Time Base 1 us div to 10 ms div Time Base Accuracy 3 Dual Channel Alternate Operation Ac or de Coupling External Sweep Mode Voltage Accuracy 13 Sensitivity 0 005 V div Power Meter Frequency Range 0 01 18 0 GHz Accuracy 1 Power Range 20 to 10 dBm HP 432A Power Meter with HP 8478B Thermistor Mount Power Supply Dual DC Output Voltage Var
23. NC Male HP 08555 60076 Wrench box end slotted 3 16 inch HP 08555 20097 Selectro Jack to Jack Adapter HP 1250 0827 Wrench open end 15 64 inch HP 8710 0946 OSM Plug to Plug Adapter HP 1250 1158 11592 60015 1250 0827 8710 0946 08555 20087 4 08555 60076 11592 60003 1250 1158 11592 60016 5060 0256 5060 0258 11592 60001 bud 5060 0257 11592 80013 11592 60011 Figure 1 6 HP 08555 60077 Service Kit Required for Adjustment amp Service Procedures 1 11 General Information Model 8555A Table 1 5 Test Accessories cont d Required Features Suggested Model 10 dB Fixed Frequency Range De 12 4 GHz HP 8491A Option 10 A Attenuator Flatness 0 2 dB 12dB Variable Frequency Range De 1 GHz HP 355C A Attenuator Flatness 0 3 dB VHF Attenuator Frequency Range De 1 GHz HP 355D A 0 60 dB in 10 dB steps P HP 909A Coaxial A Termination Option 012 30 ohm Termination Frequency Range De 18 GHz VSWR 1 1 Power Rating 0 5 Watts Connector Type N Male Dual Direc Frequency Range 100 MHz 2 GHz HP 778D Dual Directional PA tional Coupler Directivity 32 dB Coupler Directional Frequency Range 1 7 12 4 GHz HP 779D Directional Coupler 2 Directivity 26 dB Coupler Coaxial Short Type N Male Shorting Plug HP 11512A EME Low Pass Filter Cut off Frequency 2 2 GHz HP
24. SION to 10 MHz and SCAN TIME PER DIVISION to 50 MILLISECONDS Center signal on display with FREQUENCY control Reduce SCAN WIDTH PER DIVISION to 1 MHz Note amount and direc tion of signal shift Select n 3 4 10 to 10 25 GHz Frequency BAND Note change in direction and amount of shift as BAND Switch Lever is pressed Read frequency on Frequency Scale 9 GHz Figure 8 5 Signal Identification Technique cont d Model 8555A Set SCAN WIDTH to FULL and tune FRE QUENCY to place marker under any signal on the display Disregard DISPLAY UNCAL light at this time Repeat step 22 for selected signal Change BAND Switch Lever until the correct display is obtained Read frequency of signal on Frequency Scale The signal at the 4 2 graticule line just above the analyzer s noise level is the 9 GHz signal from the n 5 harmonic Signal shifts to the left approxi mately 1 and 2 3 divisions on n 4 Frequency Band LOG REF e CENTER FREQUERCY Figure 3 5b Operation Signals shown in Figure 3 5b mixer overdriven are as follows Graticule Frequency 4 4 n 3 4 5 GHz 4 2 n 5 See step 26 8 0 n 1 4 5 GHz 2 6 n 2 3 0 GHz 1 8 n 3 6 0 GHz 1 6 n 2 7 5 GHz 1 4 n 4 9 0 GHz 0 6 n 3 7 5 GHz 1 0 n 2 4 5 GHZ 2 0 n 2 9 0 GHz n 1 5 GHz n 3 9 0 GHz n 1 6 0 GHz e Use the formula below to determine the harmonic mixing mo
25. Y HEWLETT PACKARD OPERATING AND SERVICE MANUAL SPECTRUM ANALYZER RF SECTION 8555A SERIAL NUMBERS This manual applies directly to serial numbers prefixed 1436A With modifications described in Section VII this manual also applies to serial numbers prefixed 987 1043A 1114A 1116A 1138A 114384 1203A 1219A 1232A 1311A 1325A and 13264A 1343A 14164A and 1429A For additional important information about serial numbers see Instruments Covered by Manual in Section I Valuetronics International Inc 1 800 552 8258 MASTER COPY COPYRIGHT OHEWLETT PACKARD COMPANY 1971 1974 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CALIFORNIA 95404 U S A MANUAL PART NUMBER 08555 90027 MICROFICHE PART NUMBER 08555 90028 Printed AUGUST 1974 D Model 8555A Warnings Cautions WARNINGS SAFETY If this instrument is to be energized via an auto transformer for voltage reduction make sure the common terminal is connected to the earthed pole of the power source BEFORE SWITCHING ON THIS INSTRUMENT the protective earth terminals of this instrument must be connected to the protective conductor of the mains power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact The protective action must not be negated by the use of an extension cord power cable without a protective conductor grounding Make sure that only fuses with the required rated current and of
26. accuracy will be approximate with INPUT ATTEN UATION set to match external mixer loss 3 15 FIRST LO OUTPUT A 2 05 to 4 1 GHz output from the YIG tuned oscillator at a level of approximately 10 dBm Available at a test point and for use with accessory equipment Terminate the FIRST LO OUTPUT with the 50 ohm load supplied when not in use 3 16 SECOND LO OUTPUT A 1 5 GHz output from second LO at a power level of approximately 9 dBm Available as a test point and for use with accessory equipment Can be used as a test signal with INPUT ATTENUATION set to at least 20 dB Terminate the SECOND LO OUTPUT with the 50 ohm load supplied when not in use 3 17 Frequency Scales Set of 14 scales selected by the Band Switch Lever Harmonic number n associated with selected scale is shown on left edge of frequency scale IF frequency 550 MHz or 2 05 GHz being used is shown on the right edge of the scale 3 18 LO Scale Indicates the fundamental fre quency of the first LO YIG Cursor positioned by the FREQUENCY control indicates the LO funda mental center frequency in the ZERO and PER DIVISION SCAN WIDTH modes 3 19 BAND Scale Indictes the frequency range of each of the 14 frequency bands Green dot on the selected Frequency Scale indicates the fre quency BAND 3 20 FREQUENCY Control Coarse tunes the analyzer s center frequency in the ZERO and PER DIVISION SCAN WIDTH modes It is a two speed control push pull action pro
27. al Adjustment procedures are given in Figure 3 3 Additional information to assist the user during instrument operation is given in the following paragraphs 3 11 RF Input The RF Section is normally shipped with a Type N input connector Option 001 instruments are shipped with a Type APC 7 input connector Refer to Section VI for part numbers associated with connector J1 See Input Mixer Diode Characteristics below The mixer diode in the First Converter Assembly A12 will burn out if overloaded This diode is not separately replaceable it is part of a thin film microcircuit enclosed in the sealed assembly To protect the mixer diode it is a good operating practice to always set the INPUT ATTENUATION control to 50 dB before connecting the signal input CAUTION DO NOT EXCEED THE FOLLOWING MAXIMUM INPUT LEVELS Maximum Input Levels 0 01 18 GHz Connector Lehe INPUT ATTENUATION control must be in the 30 dB oy greater position when appiying 33 dBm or input mixer wil be damaged The power levels listed apply for peak or average power Do not exceed 20 volts de Apply only de voltages with vise times less than 106 volts per second Do not change IN PUT ATTENUATION levels when de voltages are applied to RF INPUT Connector CAUTION Do not connect impulse generators to 8555A input These mechanical type switching de vices can generate pulses in excess of 300 volts The broadband output from impulse genera
28. brator Output Amplitude 30 dBm 0 3 dB Frequency 30 MHz 0 3 MHz 8552A 3 kHz 8552B INPUT SPECIFICATIONS Input Impedance 502 nominal 0 01 18 GHz Reflection Coefficient lt 0 130 1 30 SWR for input RF attenuator settings 210 dB Maximum Input Level CAUTION DO NOT EXCEED THE FOLLOWING MAXIMUM INPUT LEVELS Max VOLTS num POWER input m pep 33 2 20 10 1414 Connec tor Incident on 110 10mW 20 0 707 1 0 Input Mixer 1 The INPUT ATTENUATION control must be in the 30 dB or greater position when applying 33 dBm or input mixer will be damaged The power levels listed apply for peak or average power 2 Do not exceed 20 volts de Apply only de voltages with rise times less than 106 volts per second Do not change INPUT ATTENUATION levels when dc vol tages are applied to RF INPUT Connector RF Input Connector Type N female External Mixer Input Connector BNC female LO power transfer to external mixer through connec tor as well as 2 05 GHz IF signal return to spectrum analyzer LO power typically 0 dBm SCAN TIME SPECIFICATIONS Scan Time 16 internal scan rates from 0 1 ms div to 10 sec div in a 1 2 5 sequence an Sean Time Accuracy 0 1 ms div to 20 ms div 10 50 ms div to 10 sec div 20 GENERAL SPECIFICATIONS Power Requirements 115 or 230 volts 10 50 60 Hz normally less than 225 watts varies with plug in units used Dimensions Model 140T
29. ch in direction of arrow until it releases b Firmly grasp the middle of latch flange and pull RF IF Sections straight out e Unlock the latch on each side of the RF section and exert an upward pulling force on front edge of RF Section d When the two sections separate at the front raise RF Section two or three inches and slide metal tab at rear of IF Section out of the slot with which it is engaged 2 22 Three HP 11593A 50 ohm Terminations are supplied with each HP 8555A They should be connected to the unused EXT MIXER FIRST LO OUTPUT and SECOND LO OUTPUT connectors on the front panel 2 23 STORAGE AND SHIPMENT 2 24 Original Packaging 2 25 The same containers and materials used in factory packaging can be obtained through the Hewlett Packard Sales Service offices listed at the rear of this manual 2 26 If the instrument is being returned to Hewlett Packard for servicing attach a tag indi cating service required return address instrument model number and full serial number Mark the container FRAGILE to assure careful handling 2 27 In any correspondence refer to the instru ment by model number and full serial number 2 28 Other Packaging Materials 2 29 l he following general instructions should be folowed when repackaging with commercially available materials a Wrap the instrument in heavy paper or plastic If shipping to a Hewlett Packard Service office or center attach a tag indicating the typ
30. d osc tuning ramp to maintain scan width calibration when using harmonic mixing b Optimizes the bias for the input mixer to match the harmonic number n of the YIG tuned oscillator n harmonic number shown on left of each frequency scale c Controls the overall gain of the RF Sec tion to maintain absolute calibration when using internal mixing Operation d Controls switching of the IF signal path Bypassing and disabling the second converter on the 1 and 1 550 MHz IF bands Bypassing the first converter when using external mixing on the n 6 10 and 10 frequency bands e Provides n information to signal identi fication circuit f Provides frequency information to acces sory equipment 3 24 TUNING STABILIZER Switch ON OFF control for tuning stabilization circuit The tuning stabilizer locks the first LO YIG to a 1 MHz voltage controlled crystal oscillator VCXO to reduce residual FM of the first LO The circuitry is enabled when the switch is set to ON and the SCAN WIDTH switch is in the ZERO or blue color coded PER DIVISION positions 3 25 SIGNAL IDENTIFIER Switch ON OFF control for signal identification circuit The signal identifier circuit provides a method of determining which harmonic of the 1st LO is mixing with the input signal to give the display on the CRT The circuitry is enabled when the switch is ON and SCAN WIDTH PER DIVISION control is set to 1MHz or below See Signal Identificati
31. de for modes not on the Frequency Scales i e 5 7 8 and 9 2cm true actual shift displayed n Figure 8 5 Signal Identification Technique cont d 3 15 Operation Model 8555A 236 GHz iF them SIGNAL LG SIGHAL SIGNAL UNDER INVESTIGATION NOTE BANDWIDTH uuu aces cv Grete irebair 300 kHz ae x l SCAN WIDTH ios eere ea FULL dea is not calibrated when using SCAN WIDTH PER DIVISION 10 MHz external mixer TUNING STABILIZER ON Q set eur ATTENUATION to 20 dB Connect D eO eee TM Au cable supplied with waveguide mixer to EXT i E ODO MIXER input SCAN TIME PER DIVISION 0 2 SECONDS A LOG REF LEVEL 6 0 dB LOG REF LEVEL Vemier CCW N VIDEO FILTER 5 eas osexes do rper OFF Discharge cable to avoid damage to mixer SCAN TRIGGER So since eth aras AUTO diode Touch edge of male BNC connec SCAN MODE iioii sd mese Tp Oe INT tor on cable to edge of female BNC con Input attenuator 1s not in external mixing circuit but neetor on mixer to discharge cable See switch controls position of LOG REF LEVEL index 11517A Operating Note lamps and attenuator provides termination for internal mixer input port to decrease crosstalk o Connect cable to mixer The LO signal from the RF Section and the mixing products to the RF Section are carried in this cable Adjust Display Section for a convenient display WRITING SPEED ST
32. e of service required return address model number and full serial number b Use a strong shipping container lt A double wall carton made of 350 pound test material is adequate Model 8555A Installation INTERCONNECTIONS LATCH RELEASE SCAN with g MAR INPUT Leys FER Givisios i INPUT ATTEMHUAT LATCH RELEASE PLUG LATCH SLOT RECEPTACLE METAL TAB FRONT PANEL LATCH Figure 2 1 RF Section and IF Section Interconnections 2 3 Installation c Use enough shock absorbing material three to four inch layer around all sides of the instru ment to provide firm cushion and prevent move ment inside the container Protect the control panel with cardboard 2 4 Model 85554 d Seal the shipping container securely e Mark the shipping container FRAGILE to assure careful handling Model 8555A Operation SECTION IH OPERATION 3 1 INTRODUCTION 3 2 This section provides complete operation in structions for the HP 8555A 8552A 140 series Spectrum Analyzer Front panel controls connec tors and indicators for the 8555A RF Section are identified and described in Figure 3 1 Controls and indicators for a typical Display Section and IF Section are identified and described in Figure 3 2 Refer to the appropriate IF Section and Dis play Section manuals for identification and description of controls indicators and connectors not contained in this manual Operational adjust ments are deta
33. ers are required over the fre quency range of 18 to 40 GHz 1 27 WARRANTY 1 28 The 8555A Spectrum Analyzer RF Section is warranted and certified as indicated on the inner front cover of this manual For further information contact the nearest Hewlett Packard Sales and Service Office addresses are provided at the back of this manual 1 29 RECOMMENDED TEST EQUIPMENT 1 30 Tables 1 4 and 1 5 list the test equipment and test equipment accessories required to check adjust and repair the 8555A Spectrum Analyzer RF Section 1 3 General Information Model 8555A Table 1 1 8555A 8552A 8552B Specifications FREQUENCY SPECIFICATIONS FREQUENCY RANGE Tuning Range With internal mixer 0 01 18 00 GHz With external mixer 12 4 40 GHz Selectable continuous coarse by means of push pull knob and fine tuning determine display center frequency Harmonic Mixing Mode Signal Identification Signal identifier separates unknown input signal in center of CRT into two images 2 divisions apart with image on left slightly less in amplitude when the calibrated frequency scale is advanced to the appropriate band Sean Width Full Sean Inverted marker positioned by tuning control identifies the frequency that becomes the center frequency for scan width per divi sion and zero scan modes The width of the scan depends on mixing mode Scan width n x 2000 MHz where n is the mixing mode e g for n 2 scan width is 4 GHz
34. ge INPUT ATTENUATION levels when dc voltages are applied to RF INPUT Connector o Connect input signal any frequency between 10 MHz and 18 GHz to RF INPUT Adjust PERSISTENCE INTENSITY and BASE LINE CLIPPER for a display trace without bloom ing Observe display for presence of a signal If a signal is not observed reduce INPUT ATTENUATION in steps while observing display for a signal When a signal or signals is obtained on the dis play tune FREQUENCY control to position in verted marker under signal under largest signal if more than one signal is viewed on the display Operation Set SCAN WIDTH to PER DIVISION SCAN TIME PER DIVISION to 20 MILLISECONDS and adjust INTENSITY for a convenient display Center signal on display with FREQUENCY con trol Reduce SCAN WIDTH PER DIVISION to 1 MHz and BANDWIDTH to 30 kHz keeping signal cen tered on display with FREQUENCY control In crease SCAN TIME PER DIVISION to 50 MILLI SECONDS Set SIGNAL IDENTIFIER to ON Note amount and direction signal shifts on alternate scan traces Rotate Frequency Scales with Band Switch Lever until the signal shifts two divisions to the left on alternate scans and is approximately 5 dB less in amplitude NOTE When switching from the n 1 550 MHz IF Frequency Bands allow a few seconds for instrument stabilization Voitage to the 2nd LO 1 5 GHz is removed when these bands are selected Set SIGNAL IDENTIFIER switch
35. harmonie n number and sign or is selected by the BAND Switch Lever the signal will shift two divisions to the left The shifted signal is reduced in amplitude by approxi mately 5 dB If signal shifts to the right two divisions the har monic number is correct however the sign or on the left edge of the Frequency Scale is wrong Tf the signal shifts less than two divisions on the CRT pres the BAND Switch Lever up to increase the harmonic number Note that the signal shifts in the opposite direction with each change in sign and increases in width with each increasing harmonie number Change Band Switch Lever until the signal shift is two divisions apart with the reduced signal on the left FINE TUNE to align the reduced signal on the 2 graticule line with the signal to be identified on the Center Frequency graticule line Read frequency indicated by the cursor on the Frequency Scale The signal frequency is related to the first LO harmonic by the equation Fsig nFLO IF where Fsig signal frequency n harmonie number FLO LO fundamental frequency IF frequency of first IF NOTE In the following familiarization procedure a known input signal is applied and the harmonie numbers producing the signals on the CRT display are identified The input mixer is overdriven to produce sig nals that would not normally be present on the display Operation CAUTION DO NOT EXCEED THE FOLLOWING MAXIMUM
36. iable 0 30 Vdc Output Current 0 300 mA Meter Accuracy 3 HP 6205B Power Supply DC Volt Ohm Ammeter HP 412A Volt Ohm Ammeter Voltmeter Voltage Range 1 mV 300V Accuracy 1 Input Resistance 10 megohms Ammeter Current Range 1 4 1A Accuracy 2 Ohmmeter Resistance range 1 ohm 100 megohm Accuracy 5 reading at center scale Table 1 5 Test Accessories Required Features Suggested Model Service Kit Contents HP 08555 60077 140 141 Display Section to Spectrum Analyzer Plug in Extender Cable Assembly HP 11592 60015 IF to RF Unit Interconnection Extender Cable Assembly HP 11592 60016 Selectro Female to BNC Male Test Cable 36 inches long HP 11592 60001 Selectro Male to Selectro Female Test Cable 8 inches long yeliow HP 11592 60003 1 10 Model 8555A General Information Table 1 5 Test Accessories cont d Service Kit HP Ser Selectro Female to Selectro Female Cable 8 long red HP 11592 60002 vice Kit 08555 Extender Board Assy 15 pins 30 conductors for plug in circuit boards 60077 HP 11592 60011 Extender Board Assy 10 pins 20 conductors for plug in circuit boards HP 5060 0256 Extender Board Assy 12 pins 24 conductors for plug in circuit boards HP 5060 0257 Extender Board Assy 24 pins 48 conductors for plug in circuit boards HP 5060 0258 Cable Assy R amp P Female to BNC Male HP 11592 60013 Cable Assy SMA Male to B
37. iled in Figure 3 3 and general opera ting instructions are provided in Figures 3 4 through 3 6 3 3 PANEL FEATURES 3 4 Front panel features of the 8555A RF Sec tion are described in Figure 3 1 Front and rear panel views of the HP 8555A 8552A 140T Spec trum Analyzer are shown in Figure 3 3 For a detailed description of the IF Section and Display Section controls and indicators refer to the opera tion and service manuals for those instruments Interconnection wiring between the RF Section and the IF Section and between the RF Section and the Display Section is contained in Section VIII of this manual 3 5 OPERATOR S CHECKS 3 6 Upon receipt of the instrument or when one or more sections of the analyzer are changed per form the operational adjustment procedures listed in Figure 3 3 This procedure corrects for minor differences between units and ensures that the RF Section IF Section and Display Section are properly matched 3 7 OPERATING INSTRUCTIONS 3 8 General operating instructions are contained in Figure 3 4 These instructions will familiarize the operator with basic operating functions of the spectrum analyzer Additional information cover ing signal identifying techniques and external mixer operation is contained in Figures 3 5 and 3 6 3 9 CONTROLS INDICATORS AND CONNECTORS 3 10 Front panel controls indicators and connec tors are identified and briefly described in Figures 3 1 and 3 2 Operation
38. in by frequency BAND lever 50 ohm load when not in use D YIG tuned Oscillator LO Fundamental Fre e RF INPUT Input for 01 to 18 GHz signals quency Scale Pointer indicates LO center fre Female type N connector Option 001 APC 7 quency connector INPUT ATTENUATION Attenuates input signal CAUTION from 0 to 50 dB in 10 dB steps Maximum input signal for 1 dB signal compression indicated on See O above outer dial scale Indicates 550 MHz FIRST IF Figure 3 1 Front Panel Controls Connectors and Indicators cont d 3 5 Operation Model 8555A E ir P O AR a a aa o OT DISPLAY SECTION HENCE PACKARD AF SECTA i BASE LE clare 4 WM AMAR TIEN WEE SECTION 20 q LAG MER LEWES de sss 3 SCAX MODE O Na i Auk BAN EXT PET weg With LoG LINEAR switch 11 set to LOG amplitude reference With LOG LINEAR switch lighted index lamp refers matching dB graduation set to LINEAR lighted index lamp indicates the to top LOG REF line of graticule for example if matching voltage graduation to be used as a per 30 dBm is opposite lighted lamp then top LOG division multiplier for calibrated voltage readings REF line is 30 dBm and so serves as an absolute blue marking Figure 8 2 Typical Display and IF Section Controls Connectors and Indicators Model 8555A oo 69000 090 o o o oe Plus lights when logarithmie
39. ional Electrotechnical Commission IEC recommends that the instrument panel and cabinet be grounded The Spectrum Analyzer is equipped with a three conductor power cabie the third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle the instrument is grounded To preserve the protec tion feature when operating the instrument from a two contact outlet use a three prong to two prong adapter and connect the green lead on the adapter to ground 2 17 Operating Environment 2 18 The Spectrum Analyzer uses a forced air cooling system to maintain required operating tem peratures within the instrument The air intake and filter are located on the rear of the Display Sec 2 1 Installation tion air is exhausted through the side panel per forations When operating the instrument choose a location which provides at least three inches of clearance around the rear and both sides Refer to the Display Section manual for maintenance in structions for the cooling system 2 19 Interconnections 2 20 The RF and IF Sections are normally shipped separately the plug ins must be mechani cally fitted together electrically connected and then inserted in the Display Section or mainframe To make these connections refer to Figure 2 1 and proceed as follows a Set the IF Section on a level bench Lo cate slot near right rear corner of RF Section also locate metal tab on IF Section that engages
40. iv are selectable Scan is width bandwidth dnd adeo filtering is such that symmetrical about center frequency selected by aceuracy of vertical calibration is impaired FREQUENCY 2 and FINE TUNE 3 Enabled by SCAN WIDTH mode switch 10 Q EXT MIXER input External mixer input for analyzer operation over 10 4 to 43 GHz frequency SCAN WIDTH Mode Switch Selects ZERO PER range BNC female connector accepts cabie from DIVISION 9 or FULL scan modes In ZERO external mixer Supplies LO signal to external scan mode analyzer acts as a fixed tuned receiver mixer and returns IF Signal from mixer Terminate at the frequency selected by FREQUENCY 2 in 50 ohm load when not in use See Figure 3 6 and FINE TUNE 3 In FULL scan mode the External Mixer Operation analyzer scans the full range of the selected fre quency band CAUTION QD AMPL CAL Used to match RF Section with IF To prevent damage to external mixer do Section Sets overall gain of analyzer for absolute not apply more than 1 mW to 11517A amplitude calibration mixer Frequency BANDS Set of fourteen indicates FIRST LO OUTPUT 2 to 4 GHz output from frequency ranges of analyzer Green dot on Fre YiG tuned oscillator Female BNC connector 2 Seale also indicates frequency BAND terminate in 50 ohm load when not in use selected SECOND LO OUTPUT 1 5 GHz output from O Frequeney Scale Set of fourteen scales selected second LO Female BNC connector terminate
41. lator Test Oscillator Frequency Counter Use General Information Table 1 4 Test Equipment Required Suggested Model Minimum Specifications Frequency markers spaced 1 10 100 MHz apart usable to 4 GHz Frequency Accuracy 0 01 Output Amplitude gt 40 dBm Frequency Range 1 50 MHz Output Amplitude gt 20 dBm Output Amplitude Accuracy 196 Frequency Accuracy 1 Output Impedance 50 ohms Frequency Range 40 455 MHz Frequency Accuracy 1 Output Amplitude gt 20 dBm Output Impedance 50 ohms Frequency Range 450 1230 MHz Frequency Accuracy 1 Output Amplitude gt 20 dBm Output Impedance 50 ohms Frequency Range 1 0 2 1 GHz Frequency Accuracy 1 Output Amplitude gt 20 dBm Output Impedance 50 ohms Frequency Range 2 0 4 0 GHz Frequency Accuracy 31 Output Amplitude gt 20 dBm Output Impedance 50 ohms Frequency Range 0 1 18 GHz Output Amplitude gt 20 dBm Output Impedance 50 ohms Frequency Range 10 Hz 10 kHz Output Amplitude 2 Vrms Frequency Accuracy 2 Output Impedance 600 ohms Frequency Range 10 kHz 1 3 MHz Frequency Accuracy 3 Output Amplitude 3 Vrms Output Impedance 50 ohms Frequency Range 100 kHz 18 5 GHz Accuracy 0 001 Sensitivity 100 mV rms Readout Digits 7 digits HP 8406A Comb Generator HP 606A B HF Signal Generator HP 608E F VHF Signal Generator HP 612A UHF Signal Generator HP 8614A B Signal
42. le five subdivisions per major division on horizontal and vertical axes Functions Used with Time Domain Plug ins Only Same as 141T Normal Persistence Large Screen Display Model 1438 Plug ins Same as 141T Cathode ray Tube Type Post accelerator 20 kV accelerating potential aluminized P7 phosphor Persis tence approximately 0 3 sec Graticule 8 x 10 divisions approximately 8 x 10 inch parallax free internal graticule five subdivisions per major division on horizontal and vertical axes Functions Used with Time Domain Plug ins Only Same as 141T GENERAL CHARACTERISTICS CRT BASELINE CLIPPER Front panel control adjusts blanking of CRT trace baseline to allow more detailed analysis of low repetition rate signals and im proved photographic records to be made Temperature Range Operating 0 to 40 C storage 40 to 75 C 1 7 General Information Model Number 11517A 11518A 11519A 11520A 8406A 8403A 8431A 8432A 8433A 8434A 8435A 8436A 8444A 8445B adl 360 series 362A series FH EE Model 8555A Table 1 3 Operating Accessories Waveguide Mixer Mixes inputs from 12 4 to 40 GHz with frequencies from first LO HP 10503A Coaxial Cable terminated with BNC male connectors supplied with Mixer Adapter For mating 11517A Waveguide Mixer to P band 12 4 to 18 0 GHz system Adapter For mating 11517A Waveguide Mixer to K band 18 0 to 26 5 GHz system
43. ng a serial number prefix not listed on the title page or in the Manual Changes supplement contact your nearest Hewlett Packard office 1 14 DESCRIPTION 1 15 The HP Model 8555A Spectrum Analyzer RF Section is shown in Figure 1 1 with the Model 8552B Spectrum Analyzer IF Section and the Model 141T Display Section Table 1 1 Specifica tions and Table 1 2 Supplemental Performance Characteristics are for the 8555A RF Section when used with an 8552A B IF Section and a 140 series Display Section 1 16 The 8555A plug in is the microwave RF Section for use with the 8552 series IF section and the 140 series display section Together they comprise a receiver that electronically scans an input signal and provides a visual display in the frequency domain Input signal amplitude is plotted on the CRT as a function of frequency The amplitude Y axis of the CRT is calibrated in absolute units of power dBm or voltage u V mV 50 ohm system accordingly absolute and rela tive measurements of both amplitude and fre quency can be made 1 17 The analyzer RF and IF sections form a highly sensitive super heterodyne receiver with spectrum scanning capabilities over the frequency range of 10 MHz to 40 GHz in 14 frequency bands The analyzer presents a calibrated CRT display up to 2 GHz wide Absolute calibration accuracy is maintained from 10 MHz to 18 0 GHz in 10 bands using internal mixing The frequency range from 12 4 GHz to 40 GHz i
44. o blank lower portion of scan trace Repeat adjustments as necessary during the following steps CAUTION INPUT ATTENUATION should be set to at least 20 dB before proceeding with the following step Remove 50 ohm termination from SECOND LO OUTPUT and connect a cable from SECOND LO OUTPUT to RF INPUT Tune FREQUENCY control to position the marker under the signal between the 2 and 3 graticule lines Note reading on Frequency Scale Cursor indicates 1 5 GHz Switch SCAN WIDTH to PER DIVISION Center signal on display with FREQUENCY control ERASE display to remove stored signals Set PERSISTENCE to MIN SCAN WIDTH PER DIVISION to 1 MHz and SCAN TIME to 20 MILLISECONDS Center signal on display Set SIGNAL IDENTI FIER to ON Note signal shifts to the left and is reduced in amplitude on alternate sweep scans Set SCAN WIDTH PER DIVISION to 20 MHz SCAN WIDTH to FULL INPUT ATTENUATION to 40 dB and SCAN TIME PER DIVISION to 0 2 SECONDS Model 8555A Note signal display similar to Figure 3 5a Decrease INPUT ATTENUATION to 30 dB Note display similar to Figure 3 5b Note that some signal levels increased more than 10 dB The input mixer is being overdriven see Mixer Diode Characteristics paragraph 3 13 center C FREQUENCY Figure 3 54 E Tune FREQUENCY control to place marker under O signal at 3 graticule line Set PERSISTENCE to MIN SCAN WIDTH to PER DIVISION SCAN WIDTH PER DIVI
45. on Tech nique Figure 3 5 3 3 Operation TRIT DISPLAY SECTION T E MRMEE TT PACKRANB TE AAA RM p reg WATAN ARES s a CENE CURE ffc CAMARO B cows GI WTENSELY v cus LO SIGNAL IDENTIFIER Switch Used in signal 3 4 identification technique to identify which har monic is being mixed with the input signal to obtain the display See Figure 3 5 FREQUENCY Control Coarse tunes analyzer center frequency Push pull action provides either normal or rapid tuning FINE TUNE Control Fine tunes analyzer center frequency Three tum tuning control used in narrow stabilized scan widths Model 8555A o Band Switeh Lever Frequency range selection control Bi directional control rotates Frequency Scaies and Frequency Band Shaft Encoder Shaft Encoder controls digital logic to provide automatic attenuation of Ist LO YIG tuned oscillator tuning ramp to maintain calibration on harmonie mixing The logic circuitry also controls the input mixer bias and gain of the RF Section to maintain absolute calibration In addition the logic cir cuitry controls relay switching for external mixer operation 10 4 to 40 GHz and for 2nd converter bypass 1 and 1 bands Figure 8 1 Front Panel Controls Connectors and Indicators Model 8555A Operation o TUNING STABILIZER Switch Used to lock the C AUTION Ist LO to a harmonic of a voltage tuned crystal oscillator for sean widths of 100 kHz per division DO NOT EX
46. ons are flexible Preparation for use is based on the premise that the RF and IF Sections are installed in a Display Section to make the Spectrum Analyzer physically and functionally complete for use Since the RF and IF Sections are usually received separately the piug ins must be mechanically fitted together elec trically connected and inserted in a display section or oscilloscope mainframe of the 140 series For mechanical and electrical connections refer to Figure 2 1 and paragraph 2 20 2 12 Power Requirements 2 13 The Spectrum Analyzer can be operated from a 50 to 60 hertz input line that supplies either a 115 volt or 230 volt 410 in each case power Consumed power varies with the plug ins used but is normally less than 225 watts Line power enters the Display Section or Mainframe where it is converted to de voltages and then is distributed to the RF and IF Sections via internal connectors 2 14 The 115 230 power selector switch at the rear of Display Section must be set to agree with the available line voltage If the line voltage is 115 volts the slide switch must be positioned so that 115 is clearly visible The instrument is internally fused for 115 volt operation when shipped If 230 volt source is to be used refer to fuse replace ment procedures in the display section manual 2 15 Power Cable 2 16 To protect operating personnel the National Electrical Manufacturers Association NEMA and the Internat
47. otective earth ground Grounding one conductor of a two conductor outlet is not sufficient LINE VOLTAGE SELECTION BEFORE SWITCHING ON THIS INSTRUMENT make sure the instrument is set to the voltage of the power source vii General Information igure 1 0 VELA Y M IAS S ah ee MUN UT pu RON NU SD D See UU em Roe HORN LESS RS x 3 Rese 2 OCTO TER ODEL 8555A PX v E Rv a UN e Model 8555A 1 1 Model 8555A Spectrum Analyzer RF Section with 8552B IF Section and 141T Display Section Model 8555A General Information SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual contains all information required to install operate test adjust and service the Hewlett Packard Model 8555A Spectrum Analyzer RF Section This section covers instrument identi fication description options accessories specifica tions and other basic information 1 3 Figure 1 1 shows the Hewlett Packard Model 8555A Spectrum Analyzer RF Section with the Model 8552B Spectrum Analyzer IF Section and the Model 141T Display Section 1 4 The various sections in this manual provide information as follows SECTION II INSTALLATION provides in formation relative to incoming inspection power requirements mounting packing and shipping etc SECTION II OPERATION provides infor mation relative to operating the instrument SECTION IV PERFORMANCE TESTS pro
48. paragraph 2 6 for recom mended claim procedures If the instrument appears to be undamaged perform the electrical check see paragraph 2 4 The packaging material should be retained for possible future use 2 4 Electrical Check 2 5 The electrical check consists of following the performance test procedures listed in Section IV These procedures allow the operator to determine that the instrument is or is not operating within the specificaions listed in Table 1 1 The initial per formance and accuracy of the instrument are certi fied as stated on the inside front cover of this manual If the instrument does not operate as specified refer to paragraph 2 6 for the recom mended claim procedure 2 6 CLAIMS FOR DAMAGE 2 1 If physical damage is found when the instru ment is unpacked notify the carrier and the near est Hewlett Packard Sales Service office immedi ately The Sales Service office will arrange for repair or replacement without waiting for a claim to be settled with the carrier 2 8 The warranty statement for the instrument is on the inside front cover of this manual Contact the nearest Sales Service office for information about warranty claims 2 9 PREPARATION FOR USE CAUTION Before applying power check the rear panel slide switch on the Display Section for proper posi tion 115 or 230 volts 2 10 Shipping Configuration 2 11 Because of individual customer require ments shipping configurati
49. s Used with Time Domain Plug ins Only Intensity modulation calibrator beam finder Special Order Chassis slides and adapter kit Fixed slides order HP Part Number 1490 0714 pivot slides order HP Part Number 1490 0718 slide adapter kit for mounting slides on scope order HP Part Number 1490 0721 Persistence Normal Natural persistence of P31 phosphor approximately 0 1 second Variable Normal Writing Rate Mode Continuously vari able from less than 0 2 second to more than one minute typically to two or three minutes Maximum Writing Rate Mode Typically from 0 2 second to 15 seconds Erase Manual erasure takes approximately 350 ms CRT ready to record immediately after erasure Storage Time Normal writing rate more than 2 hours at reduced brightness typically 4 hours More than one minute at maximum brightness Fast writing speed more than 15 minutes typically 30 minutes at reduced brightness or more than 15 seconds at maximum brightness Functions Used with Time Domain Plug ins Only Intensity modulation calibrator beam finder Normal Persistence Model 140T Plug ins Same as 141T Cathode ray Tube Type Post accelerator 7300 volt potential medium short persistence P7 phosphor tinted and etched safety glass faceplate re duces glare Normal persistence of P7 phos phor approximately 0 3 sec Graticule 8 x 10 division approximately 7 6 x 9 5 em parallax free internal graticu
50. s covered in 4 bands through the use of external mixers 1 18 Instrument controls are arranged so that the operator can identify type and measure signal parameters with a minimum of switching For wide spectrum analysis the operator can choose a preset scan width covering the full range of each frequency band For a more detailed study the spectrum width can be progressively narrowed to Model 8555A as little as 2 kHz div or the scanning capabilities can be eliminated altogether to use the instrument as a fixed tuned receiver A 300 kHz IF bandwidth is automatically selected for full scan operation for variable scan and fixed frequency operation bandwidths as narrow as 100 Hz can be selected A single switch will automatically enable the first LO tuning stabilization circuit when scan widths of 100 kHz per division or less are selected A signal identifier circuit controlled by an on off switch allows the operator to quickly determine the har monic mixing mode and select the appropriate frequency band The signal identifier can be enabled for scan widths of 1 MHz per division or less 1 19 OPTIONS 1 20 Option 001 Replaces type N with type APC 7 connector 1 21 Option 002 for the Model 8555A is a limiter which can be installed between the RF Section s INPUT port and the input attenuator to protect input circuitry from being overdriven See Appendix A for details regarding Option 002 1 22 ACCESSORIES SUPPLIED
51. signal level to input mixer 11517A external mixer 12 4 40 GHz gain compression lt 1 dB for 15 dBm peak or average signal level to input mixer FREQUENCY CHARACTERISTICS RESOLUTION See Figure 1 5 for curves of typical 8555A 8552A and 8555A 8552A spectrum analyzer resolution for different bandwidths i i i i i i Typical Frequency Response i t Tl all 1dB i15dBJ 80 2 dB 10 kHz BW FREQUENCY Figure 1 4 Typical Spectrum Analyzer Sensitivity and Frequency Response 1 GHz 10 GHz 100 GHz FREQUENCY DRIFT Long Term Drift At fixed center frequency after 2 hour warm up Stabilized 3 0 kHz 10 min Unstabilized 25 kHz 10 min Stabilization Range First LO can be automatically stabilized to internal erystal reference for scan widths of 100 kHz div or less OUTPUT CHARACTERISTICS First LO Output 10 dBm 50 ohms 2 05 4 10 GHz Second LO Output 10 dBm 50 ohms 1500 MHz Third LO Output 5 dBm 50 ohms rear panel 500 MHz Pen Lift Output 0 to 14 volts 0 volts during scan cycle Output available in Int and single scan modes and Auto Line and Video scan trigger Vertical Output 100 mV per major division on CRT display output impedance lt 100 ohms SCAN CHARACTERISTICS Sean Mode Int Analyzer repetitively scanned by internally generated ramp synchronization selected by sean trigger e m a s IN
52. to OFF Center signal on CRT with FREQUENCY control Read frequeney of signal indicated by cursor on Fre quency Scale If additional signals were observed during step 7 above they may be identified in the same manner Set SCAN WIDTH to FULL SCAN WIDTH PER DIVISION to 20 MHz BANDWIDTH to 30 kHz and SCAN TIME PER DIVISION to 0 2 SEC ONDS Tune FREQUENCY control to position inverted marker under signal of interest Repeat steps 8 through 13 to identify signal frequency Figure 3 4 General Operating Instructions 01 to 18 0 GHz cont d 3 11 Operation Model 8555A DISPLAY ABIST QR onn o mRNS NOTE O Set SIGNAL IDENTIFIER switch to ON This procedure is given in two parts Steps 1 through 10 provides one signal identification technique for use during normal operation Steps 11 through 27 provides a procedure for operator Reduce SCAN WIDTH PER DIVISION to 1 MHz Keep signal centered on display with FINE TUNE control familiarization o Alternate sweep scans across the display CRT will Center unknown signal on the display use FINE displace the unknown signal to the left or right of TUNE when analyzer is stabilized center Figure 3 5 Signal Identification Technique 3 12 Model 8555A Reduce SCAN WIDTH PER DIVISION and BANDWIDTH to separate other signals on the dis play Keep the signal under investigation centered on the display Note direction and spacing of signal shift on the CRT When the correct
53. vides information required to ascertain that the instrument is performing in accordance with published specifications SECTION V ADJUSTMENTS provides infor mation required to properiy adjust and align the instrument after repairs are made SECTION VI REPLACEABLE PARTS pro vides ordering information for all replaceable parts and assemblies SECTION VII MANUAL CHANGES nor mally will contain no relevant information in the original issue of a manual This section is reserved to provide back dated and up dated information in manual revisions or reprints SECTION VII SERVICE includes ali in formation required to service the instrument 1 5 On the title page of this manual below the manual part number is a Microfiche part num ber This number may be used to order 4 x 6 inch microfilm transparencies of the manual Each microfiche contains un to 60 photo duplicates of the manual pages The microfiche package also includes the latest Manual Changes supplement as well as all pertinent Service Notes 1 6 WARNINGS AND CAUTIONS 1 7 WARNING Ensure that the Spectrum Analy zer and any device connected to it are both properly grounded to the same power line ground An interrupted path from earth ground to an instrument chassis safety ground an open third wire ground lead in a cord for example see Figure 1 2 below can develop a potential V equal to one half of the power line voltage This may cause a shock hazard
54. viding normal or rapid tuning Do not use coarse tuning when analyzer is stabilized TUNING STABILIZER ON and SCAN WIDTH PER DIVISION set to blue color coded numbers When stabilized coarse tuning will cause signal to jump off CRT screen 3 21 FINE TUNE Three turn control fine tunes the analyzer s center frequency in the ZERO and PER DIVISION SCAN WIDTH modes Use FINE TUNE control to tune analyzer in stabilized mode see FREQUENCY control above Provides a 1MHz tuning range of the 1st LO YIG on fundamental mixing 3 22 DISPLAY UNCAL Warning indicator asso ciated with BANDWIDTH SCAN WIDTH SCAN TIME PER DIVISION and VIDEO FILTER controls Lamp lights when control settings are Model 8555A such that the calibration of the instrument is impaired On some control settings it is acceptable for the DISPLAY UNCAL light to be on if the light subsequently goes off when either the SCAN TIME PER DIVISION or SCAN WIDTH PER DIVISION control is switched one position counterclockwise The indicator lamp bulb is replaceable from the front panel HP Part Number 2140 0259 incandescent lamp 12 volt 06 ampere type T1 bulb Tum plastic lens cover counterclockwise to remove cover 3 23 BAND Switch Lever Selects frequency scale from a set of 14 frequency scales The band switch lever also controls a shaft encoder on the fre quency scale drum that performs several functions a Controls attenuation of the 1st LO YIG tune
55. with this slot b Grasp the 8555A RF Section near middle of chassis and raise until it is a few inches above the IF Section c Tilt RF Section until front of assembly is about 2 inches higher than the rear d Engage assemblies in such a way that metal tab on the rear of the IF Section slips through the slot on RF Section e With the preceding mechanical interface completed gently lower RF Section until electrical plug and receptacle meet f Position RF Section as required to mate the plug and receptacle When plug and receptacle are properly aligned only a small downward pres sure is required to obtain a snug fit g Position the latch on each side of the RF Section to lock the RF and IF Sections together h Remove the 50 ohm lead assembly AT4 shipped taped to top of the RF Section and in stall at the AUXILIARY A connector on the rear panel of the Display Section On Display Sec tions not equipped with an AUXILIARY A con nector install 50 ohm load assembly AT4 at AUXILIARY A connector on rear of RF Sec tion i Pick up the RF IF Sections and center in opening of Display Section Push forward until assembly fits snugly into Display Section main frame j Push in front latch to securely fasten assembly in place 2 2 Model 8555A 2 21 To separate the RF IF Sections from Dis play Section and to separate the RF Section from the IF Section proceed as follows a Push front panel lat
56. xed and variable persistence storage CRT however the latter is especially vulnerable to operational errors of this ty pe Makes base line parallel with the horizontal grati cule line Focuses CRT beam Used with FOCUS control 22 to obtain smallest spot with maximum roundness Lights when line voltage is applied and instrument is turned on 8 88 6 Switches line voltage to instrument When used with 1400 series oscilloscope plug ins intensifies and returns beam to CRT regardless of deflection potentials Produces no effect on analy zer displays o Display CRT with graticule lines E Selects non storage function CAUTION Use storage funetion when possible to prevent damage to the CRT Press to ERASE when in STD or FAST writing speed Selects writing speed Varies time the trace is visible 132 Selects storage time Press to store signal display Storage time relative display brightness in storage mode is adjusted by 32 Manual scan control positions the electron beam on CRT when using MAN SCAN mode Figure 3 9 Typical Display and IF Section Controls Connectors and Indicators cont d Operation Model 8555A Figure 8 8 Operational Adjustments Modei 8555A o o0 6 INPUT POWER AND INTENSITY MODULATION Set 115 230 switch to correspond with available input voltage The instrument is fused for 115 volt 50 60 Hz operation if 230 volt power is used refer
57. ximum levels to INPUT 01 18 GHz connector and to input mixer Log Reference Level From 130 dBm to 10 dBm in 10 dB steps Log reference level ver nier O to 12 dB continuously Linear Sensitivity From 0 1 uV div to 100 mV div in a 1 2 sequence Linear sensitivity vernier 1 to 0 25 attenuation ratio continu ously Sensitivity Average Noise Level Specified for 1 kHz band width Using lower bandwidths will improve average noise level e g use of 100 Hz band width will improve noise level in the 1 5 to 3 55 GHz frequency range from 117 dBm to 127 dBm max With INTERNAL Coaxial Mixer Frequency Mixing Average Range Mode rus Noise Level GHz n i dBm max 0 01 2 05 1 2050 115 1 50 3 55 1 550 117 2 07 6 15 2 2050 108 2 60 4 65 550 117 4 11 6 15 1 2050 115 4 13 10 25 3 2050 103 6 17 10 25 2 2050 105 6 19 14 35 4 2050 95 8 23 14 35 3 2050 100 10 29 18 00 4 2050 90 With 11517A EXTERNAL Waveguide Mixer and Appropriate Waveguide Tapers Frequency Range Average Noise Level Typ 12 4 18 0 GHz 90 dBm 18 0 26 5 GHz 85 dBm 26 5 40 0 GHz 75 dBm Model 8555A General Information Table 1 1 8555A 8552A 8552B Specifications Continued Residual Responses Referred to signal level at input mixer on fundamental mixing lt 90 dBm Display Range Log 70 dB 10 dB div with 8552B 2 dB div log expand on a 16 dB display Linear From 0 1 mV to 100 mV div in a 1
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